Carbureter.



,438. PATENTED JULY so, 1907.

2., B. & L. s. GUSHMAN.

GARBURBTER.

APPLICATION rmm APR.17,1906.

[NVENTOR3 WITNESSES.-

A TTORNE Y5 piston, the quantity parts, hereinafter fully described,

fully hereinafter appear,

tails of the structure tion shown in'Fig. 1.

and a mixing chamber 11, the latter being connected UNITED STATES PATENT OFFICE.

EVERETT B. OUSH-MAN AND LESLIE S. CUSHMAN, OF LINCOLN, NEBRASKA.

CARBURETER.

Specification of Letters Patent. Application filed April 17, 1906. Serial No. 312,234.

No, 861,438. Patented July 30, 1907.

through a port 12 with the inlet port of the enginecylinder. The float feed chamber is provided with a discharge passage 15, leading to a jet nozzle 16 within the mixing chamber, and through which the gasolene or other liquid is drawn by the partial vacuum created within the crank case of the engine on the out or compression stroke of the piston. The jet nozzle is pro vided with a needleregulating valve 17 which may be adjusted to control the quantity of liquid fed at each operation.

Arranged within the chamber 11 is a hollow throttle valve 18, having a port 19, immediately opposite the port 12, and the lower end of the valve is provided with air inlet ports 20 through which air may enter from the open lower end of the casing, and this portion of the casing contains an adjustable disk valve 2] which may be turned to the desired position for the purpose of controlling the quantity of air admitted to the lowerportion of the valve. To the top of the valve is connected a handle 23, which is operated in the usual manner for controlling the cut off and throttle the engine. It is found that in operating carbureters of this gen eral type, a. rapid increase in suction when the engine A is running at very high speed will result in the delivery of increased quantities of sulting in considerable waste and fouling of the cylin- -der. To obviate this,

laterally extended chamber 25 having an air inlet port 26 that is normally closed by an inwardly opening valve 27. This valve is pivoted on a pin 28 carriedby ears29 projecting inward from the casing, and the valve has a pendent arm 30 against which bears one end of a compression spring 31, the latterbeing seated in a pocket 32 that forms part of said casing. At the outerendof the pocket is a screw' 33 which bears against the outer end of the spring 31, so that the stress of the spring may be adjusted for the trolling the-opening of the valve, and when so adjusted the screw may be locked in place by a nut The spring is normally placed under such stress that the valve will not be To all whom it may concern:

Be it known that rotor, of which the following is a specification. This inventionrelates to carbureters,

in connection with internal combustion engines. In ordinary carburetors of this general class where the liquid, such as gasolene, benzene-naphtha; or alcohol is drawn into the mixing chamber of the carburetor by the partial vacuum created by the movement of the of liquid drawn .from the feed chamber at each operation increases in proportion to the increase in speed of the engine, and in many cases the quantity of liquid is greatly in excess of that necessary for the work, resultingin waste and in fouling the cylinder, as well as rendering it diflicult to control the speed.

The principal object of the present invention is to provide a carbureter which will give a constant mixture of air and gasolene or other liquid at all loads and speeds of the engine, and which may be properly adjusted to secure a given maximum speed, while at the same time itinsuresthedelivery of precisely the same 'amount of liquid for the formation of each explosive charge.

A further object of the invention is to provide a carburetor in which the mixing chamber is provided with an adjustable valve which-will open automatically to admit a quantity of air when .the speed of the-engine increases and the effect of the suction becomes abnormal. 1

With these and other objects in view, as will more the invention consists in certain novel features of construction and arrangement of illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being,understood that various changes in the form, proportions, size and minor demay be made without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings:-'Figure 1 is a sectional elevation of a carbureter constructed in accordance with the invention. Fig.2 is a plan view of the same showing the mixing chamber and valve in section. Fig. 3 is ii -sectional elevation of the mixing chamber, the section being ata right angle to the plane of the sectime preventing'th'e withdrawal Similar numerals of reference are employed to indicate corresponding parts throughout the several figures of the drawings.

'Th'e carbureter comprises a float feed chamber '10 without regard to engine.

Weclai'm:-- 1. The combination with a cai-bureter having a casing provided with an oflset or extended variations in the speed orfiload ,of the the casing is provided with a f thus diluting the explosive mix of gasolene or other liquid, thus keeping the explosive mixture ofnniforin quality gasolene or other liquid, re-

purpose of conallowed to move to open position when the engine is running at normal speed, butif the creasing suction to draw larger quantities of liquid mumn mm auxiliary air port is located, of a pivotally mounted valve normally closing said port, a spring tending to maintain the valve in closed position, a spring pocket, an adjusting screw arranged at the outer end of the pocket and bearing against the spring, and means for locking said screw in adjusted position.

- 2. The combination in a carhureter, of a casing, a hollow throttle valve arranged therein; said valve being provided with bottom openings, a ya lve disk on which said valve is seated, the disk being, also, provided with openings, whereby the turning oi thevalve may regulute'the normal inflow of air'to the-interior of the valve, a fluid fuel jet nozzle extending into the interior of the valve at a point above the bottom thereof, said casing being provided at one sidewith a recess, theouter wall of which has an opening forming an auxiliary air port, an inwardly opening valve closing the auxiliary air port, a spring tending to maintain the valve in closed position and means for adjusting the stress of the spring.

In testimony that we claim the foregoing as our own, we have hereto :iflixed our signatures in the presence of two witnesses.

EVERETT B. CUSHMAN. LESLIE S. CUSHMAN.

Witnesses:

A. 0. 'iunon, GimcnE. MILLS. 

